<template>
  <div class="swiper-container" ref="swiperForZoom">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for="(skuImage, index) in skuImageList" :key="skuImage.id">
        <img :src="skuImage.imgUrl"
             :class="{active: currentActiveImgIndex === index}"
             @click="handleChangeIndex(index)"
        >
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
  import Swiper from 'swiper'
  export default {
    name: "ImageList",
    props: ['skuImageList'],
    data(){
      return {
        currentActiveImgIndex: 0,
      }
    },

    watch: {
      skuImageList(newVal, oldVal){
        if (newVal.length){
          this.$nextTick(() => {
            new Swiper(this.$refs.swiperForZoom, {
              // 如果需要前进后退按钮
              navigation: {
                nextEl: ".swiper-button-next",
                prevEl: ".swiper-button-prev",
              },
              slidesPerView : 'auto',
              // slidesPerView : '3',
            });
          });
        }
      },
    },

    methods: {
      handleChangeIndex(index){
        this.currentActiveImgIndex = index;
        // 兄弟组件进行通信
        // 通知兄弟组件, 图片的索引值变了。
        this.$bus.$emit('getNewIndex', index)
      }
    }
  }
</script>

<style lang="less" scoped>
  .swiper-container {
    height: 56px;
    width: 412px;
    box-sizing: border-box;
    padding: 0 12px;

    .swiper-slide {
      width: 56px;
      height: 56px;

      img {
        width: 100%;
        height: 100%;
        border: 1px solid #ccc;
        padding: 2px;
        width: 50px;
        height: 50px;
        display: block;
        &:hover {
          border: 2px solid blue;
          padding: 1px;
        }
      }
      .active {
        border: 2px solid red;
        padding: 1px;
      }
    }

    .swiper-button-next {
      left: auto;
      right: 0;
    }

    .swiper-button-prev {
      left: 0;
      right: auto;
    }

    .swiper-button-next,
    .swiper-button-prev {
      box-sizing: border-box;
      width: 12px;
      height: 56px;
      background: rgb(235, 235, 235);
      border: 1px solid rgb(204, 204, 204);
      top: 0;
      margin-top: 0;
      &::after {
        font-size: 12px;
      }
    }
  }
</style>
